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Summary of Significant Accounting Policies (Accrued Expenses and Other Current Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Summary of Significant Accounting Policies [Abstract]    
Compensation related reserves $ 22,429 $ 16,329
Product warranty and recall obligations 6,867 6,727
Accrued income taxes 6,897 1,930
Other [1] 16,353 16,503
Total accrued expenses and other current liabilities $ 52,546 $ 41,489
[1] "Other" is comprised of miscellaneous accruals, none of which individually contributed a significant portion of the total.